Description
The Lennox 73K20 is an OEM automatic-reset high-limit switch engineered to protect furnaces and heating systems from dangerous overheating conditions. When supply-air temperatures exceed the upper threshold, the limit switch opens the control circuit, shutting down the burner and preventing heat exchanger damage. Once temperatures fall back to the safe reset point, the switch automatically restores operation — eliminating the need for manual intervention and minimizing system downtime.
Key Features
- Auto (automatic) reset operation — no manual reset required
- Opens at 160°F to interrupt burner operation on overtemperature
- Resets at 130°F to restore normal system operation
- OEM Lennox replacement part for precise fit and reliable performance
- Protects heat exchangers, burners, and downstream components from thermal damage
- Direct drop-in replacement minimizes installation time
Product Specifications
- Brand: Lennox
- Part Number / SKU: 73K20
- Switch Type: Automatic Reset Limit Switch
- Trip Temperature: 160°F
- Reset Temperature: 130°F
- Temperature Range: 130–160°F
Application
Designed as a direct OEM replacement for Lennox furnaces and heating equipment, the 73K20 limit switch is the trusted choice for HVAC technicians and service professionals who demand factory-spec reliability. Always verify compatibility with your specific Lennox model before installation.
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